mech questions[1]

8/6/2019 Mech Questions[1]

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UNIT1

1. What are microprocessor based controllers? Explain with reference

to automatic Camera

2. What are sequential controllers? Explain with reference to

automatic washing machine.

3. What are the basic elements of a closed-loop system? Explain with

reference to person measuring temperature of a room.4. Draw the block diagram of a closed loop system with basic elements

, and Explain the function

of each block.

5. What are sequential controllers? Explain with reference to four

stroke sequence..

UNIT2

1. Differentiate the following performance terminology used in sensors.

i) Accuracy and Precision. ii) Threshold and Resolution

iii) Range and Span. iv) Hysteresis and Dead band.

v) Repeatability and Reproducibility.vi) Three types of Linearity vii) Sensitivity and Resolution.

2. Explain the working of Hall effect sensor with neat sketch.

3. Explain the types ,construction , working , merits and demerits of

Potentiometer as a displacement sensor.

4. Describe hall sensor application as liquid level sensor.

5. Explai three types capacitance sensor s with application example.

6. How are strain gage sensors constructed?

7. Derive the expression for gage factor of a strain gage.

8. An electrical strain gage with resistance of 100 ohms and gage

factor of 2.0 is subjected to a strain of 0.001. Determine the change in resistance.

9. How are LVDT sensors constructed? Explain its working in detail

with a linear displacement application.10. Explain the working principles of three type light sensors .

11. Define proximity and hence explain four types of proximity sensors

with sketch.

12. Explain various protection techniques adopted in signal

conditioning.

13. What are the characteristic features of operational amplifier?

14. List eight applications of operational amplifiers.

15. Explain with neat sketch the working of following sensors with applications.

i) Lvdt ii) Hall sensor iii) Eddy current sensor

16. List various factors considered in the selection of sensors .

17. i) Explain the construction and working of LVDT .(8)

ii) Discuss its application as pressure measurement. .

(8)


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18. Give five reasons for the need of processing sensor signals.

19. Explain two operational amplifier circuits used in signal

processing.

20. Explain the construction and working of strain gage sensor.

Derive the expression for its gage sensitivity.

Describe its application as Load cell.

21. Explain five processes adopted in signal conditioning a sensor signal.22. Discuss various protections used to interface sensor to microprocessor.

22. Explain the function of following encoders with neat sketch.

(i) Incremental encoder. (ii) Absolute encoder.

23. Temperature sensors ( thermister , RTD , thermocouple, I.C sensor,

bimetaliuc)

24. Explain cold junction compensation in thermocouple measurement.

25. Draw the circuit of instrumentation amplifier and write its gain expression.

26. What is comparator? Explain its application as temperature switch.

UNIT3

1. Explain the principle and operation of variable reluctance stepper motor.2. List the stepper motor specifications and hence draw its

characteristics.

3. Tabulate the comparison between the hydraulic and pneumatic motion

converters.

4. Explain with the help of neat diagram the components of

1. Hydraulic system 2. Pneumatic system.

5. Explain the principle and operation of permanent magnet

stepper motor.

6. Draw the Speed Torque characteristics of stepper motor .

7. Describe the construction and working of a separately excited DC motor

8. Draw its torque speed characteristics and give your comments on it.

9. Derive the expression for its torque and draw its Torque vsSpeed characteristic.

10. Describe the construction and working of following

electrical drives with sketch.

i) Servo motor ii) Stepper motor

11. Define six important specifications of stepper motor .

12. Explain with suitable sketches the following control modes.

i) Proportional ii) Integral iii) Two step iv) Derivative.

13. i) Explain the working principle of D.C motors with a

neat sketch

ii) Explain four classifications of D.C Motors.

UNIT4

1. Draw the architecture of PLC and define the function of each block.

2. How plc can be used to handle analog input?

3. Draw the plc diagram to construct a motor starter unit.

4. Explain how the timer and counter operations are carried out in PLC.


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5. Explain the following timer operations carried out by PLC

i) On delay timer ii) Off delay timer iii) Cascade timer

iv)Cyclic timer.

6. How plc can be used to control the temperature of a water bath.

7. Explain with ladder diagram and program how the following

logic operations are

carried out using PLC AND ,OR, NAND, NOR ,EX-OR8. How does PLC carry out the Counter operation.

Draw a ladder diagram to direct 6 items along path 1 for

packaging in a box and then 12 items

along path 2 for packaging in another box.

9. Explain the function of internal relays in PLC. Explain

its applications (cylinder sequencing)

10. What are various specification of PLC.

UNIT5

1. Discuss in detail the mechatronic application of a pick and placerobot. Draw the plc diagram for its operation..

2. Discuss in detail the mechatronic application of car engine

management system . Mention the sensors used for each measurement and

actuators used for each control.

3. Discuss in detail the mechatronic application of an automatic camera.

Write the programming sequence for its operation..

4. Discuss in detail the mechatronic application of automatic car

park barrier system. Mention the sensors and actuators used for each control.

5. Design a mechatronics system to transfer materials from shop

floor to stores in an automobile manufacturing plant. Explain the function of

various sensors and actuators used in the system.

6. Explain in detail various stages used in Mechatronics system design process.7. I) Tabulate the differences between Traditional and Mechatronics

approach in designing systems.

ii) Design of bathroom scales in both approaches


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14. a) i) Draw the architecture of PLC with a block diagram and

explain. (10)

ii) Explain latch operation with

reference to PLC.

(6)

(or)

b) i) What are four data handling operationscarried out by PLC. (8)

ii) How do PLC carry out various timer and

counter operations. (8)

15.a) i) What are the basic elements of a closed-loop system?

Explain with reference

to person measuring temperature of a room.

(10)

ii) List six factors to be considered in

selecting sensor for an application. (6)

(or)b) What are sequential controllers? Explain with reference to Washing machine.

mech questions[1]

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